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000329_news@columbia.edu_Fri Nov 3 12:31:50 1995.msg
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From: Stuart.Biggar@opt-sci.arizona.edu
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Maximum transfer speed
Date: 3 Nov 1995 12:31:50 GMT
Organization: University of Arizona, Optical Sciences Center
Lines: 44
Message-Id: <47d23m$rii@news.ccit.arizona.edu>
References: <Pine.HPP.3.91.951030000148.24557B-100000@bluejay.creighton.edu> <475c3c$ac7@apakabar.cc.columbia.edu> <1995Oct31.121502.65498@cc.usu.edu>
Reply-To: Stuart.Biggar@opt-sci.arizona.edu
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In <1995Oct31.121502.65498@cc.usu.edu>, jrd@cc.usu.edu (Joe Doupnik) writes:
>In article <475c3c$ac7@apakabar.cc.columbia.edu>, fdc@watsun.cc.columbia.edu (Frank da Cruz) writes:
>> In article <Pine.HPP.3.91.951030000148.24557B-100000@bluejay.creighton.edu>,
>> Psychos 'R Us <honge@creighton.edu> wrote:
>> : ...
[snip]
>> :
>> The most likely explanation involves the Hayes ESP board. It can be used
>> at three different levels: nonbuffered 8250 UART compatibility mode,
>> 16-byte FIFO 16550A UART compatibility mode, and "native" ESP mode (with
>> 1K buffer, DMA, etc), which is quite different from anything else on the
>> planet and requires special drivers. Now obviously Hayes Smartcom knows
>> how to drive the ESP board to full advantage, hence the higher transfer
>> rates with Hayes software. I expect that the OS/2 serial driver knows
>> enough about the ESP to put it into 16550A mode, but beyond that, does not
>> bother with the Hayes-specific features.
>>
>> I might be mistaken, but I believe that some special magic is required to
>> put the ESP in 16550A mode, and this magic first appeared in MS-DOS Kermit
>> version 3.14. If that is true, then previous releases probably use it in
>> character-at-a-time 8250 mode, which would explain the symptoms you
>> report. We did look at adding a Hayes ESP driver to MS-DOS Kermit, but it
>> turned out to be a huge amount of work for a relatively small audience,
>> and so it wound up in a rather low position on our priority list.
>>
>> - Frank
>---------
> On the Hayes ESP board. MSK does not have special code for it.
>As things turned out none was needed if the board is configured by the
>ESP configuration program. It looks like a 16550A UART. The fancy DMA
>transfer capability of the board is, um, not exactly what a communications
>program would use and details are best left between Hayes and the programmer.
>There is a Windows driver for the board, from Hayes (with that DMA stuff),
>but it also runs without it.
> So the obvious suggestion here is to re-run the ESP configuration
>program to be sure it's capabilities have not faded from static memory.
> Joe D.
One further data point: if you use OS/2, the shareware SIO serial port
drivers know how to use the ESP board (single interrupt for both ports,
very high port rates, ...). Last time I checked the current version of
SIO was 1.53.
Stuart Biggar